2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
9 package org.opendaylight.netconf.mapping.api;
11 import com.google.common.base.MoreObjects;
12 import com.google.common.base.Optional;
13 import com.google.common.base.Preconditions;
14 import java.util.Objects;
16 public final class HandlingPriority implements Comparable<HandlingPriority> {
18 public static final HandlingPriority CANNOT_HANDLE = new HandlingPriority();
19 public static final HandlingPriority HANDLE_WITH_DEFAULT_PRIORITY = new HandlingPriority(Integer.MIN_VALUE);
20 public static final HandlingPriority HANDLE_WITH_MAX_PRIORITY = new HandlingPriority(Integer.MAX_VALUE);
22 private Integer priority;
24 public static HandlingPriority getHandlingPriority(int priority) {
25 return new HandlingPriority(priority);
28 private HandlingPriority(int priority) {
29 this.priority = priority;
32 private HandlingPriority() {
36 * Get priority number.
38 * @return priority number or Optional.absent otherwise
40 public Optional<Integer> getPriority() {
41 return Optional.fromNullable(priority);
44 public HandlingPriority increasePriority(int priorityIncrease) {
45 Preconditions.checkState(priority != null, "Unable to increase priority for %s", this);
46 Preconditions.checkArgument(priorityIncrease > 0, "Negative increase");
47 Preconditions.checkArgument(Long.valueOf(priority) + priorityIncrease < Integer.MAX_VALUE,
48 "Resulting priority cannot be higher than %s", Integer.MAX_VALUE);
49 return getHandlingPriority(priority + priorityIncrease);
52 public boolean isCannotHandle() {
53 return this.equals(CANNOT_HANDLE);
57 @SuppressWarnings("checkstyle:parameterName")
58 public int compareTo(HandlingPriority o) {
62 if (isCannotHandle()) {
65 if (o.isCannotHandle()) {
69 if (priority > o.priority) {
72 if (priority.equals(o.priority)) {
75 if (priority < o.priority) {
79 throw new IllegalStateException("Unexpected state comparing " + this + " with " + priority);
83 public boolean equals(Object obj) {
87 if (!(obj instanceof HandlingPriority)) {
91 HandlingPriority that = (HandlingPriority) obj;
93 return Objects.equals(priority, that.priority);
97 public int hashCode() {
98 return priority != null ? priority.hashCode() : 0;
102 public String toString() {
103 return MoreObjects.toStringHelper(this)
104 .add("priority", priority)